Intangible Assets - Indefinite-Lived Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Indefinite-lived Intangible Assets
Indefinite-lived intangible assets	$ 4,716	$ 4,696
International routes and slots
Indefinite-lived Intangible Assets
Indefinite-lived intangible assets	2,583	2,563
Delta tradename
Indefinite-lived Intangible Assets
Indefinite-lived intangible assets	850	850
SkyTeam-related assets
Indefinite-lived Intangible Assets
Indefinite-lived intangible assets	661	661
Domestic slots
Indefinite-lived Intangible Assets
Indefinite-lived intangible assets	$ 622	$ 622